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Constraints on the pre-eruptive magmatic history of the Quaternary Laacher See volcano (Germany)
Springer Science and Business Media LLC - Tập 175 - Trang 1-22 - 2020
Smruti Sourav Rout, Gerhard Wörner
Ba zonation patterns in sanidine phenocrysts from mafic and intermediate phonolite and crystal-rich cumulates from the Laacher See volcano (12.9 ka) in western Germany document diffusion times suggestive of periodic recharge events throughout the magma reservoir’s entire lifespan of ~ 24 ky. Phenocrysts analysed from samples that formed late at the base of the compositionally zoned magma reservoir...... hiện toàn bộ
The stability of merwinite in the system CaO-MgO-SiO2-H2O-CO2 with CO2-poor fluids
Springer Science and Business Media LLC - Tập 112 - Trang 385-392
Jincheng Zhou, L. C. Hsu
The stability of merwinite (Mw) and its equivalent assemblages, akermanite (Ak)+calcite (Cc), diopside (Di)+calcite, and wollastonite (Wo)+monticellite (Mc)+calcite was determined at T=500–900° C and P f=0.5–2.0 kbar under H2O−CO2 fluid conditions with X CO 2=0.5, 0.1, 0.05, and 0.02. Merwinite is stable at P f=0.5 kbar with T>700° C and X CO 2<0.1. At P f=2.0 kbar, the assemblage Di+Cc replaces m...... hiện toàn bộ
Phosphorus zoning as a recorder of crystal growth kinetics: application to second-generation olivine in mantle xenoliths from the Cima Volcanic Field
Springer Science and Business Media LLC - - 2017
Ioannis Baziotis, Paul D. Asimow, Theodoros Ntaflos, J. W. Boyce, F. M. McCubbin, C. Koroneos, Diego Perugini, Stephanie Flude, Michael Storey, Yongsheng Liu, Stephan Klemme, Jasper Berndt
A model system for mineral facies in pelitic schists
Springer Science and Business Media LLC - Tập 58 - Trang 243-277 - 1976
James B. Thompson, Alan Bruce Thompson
The system Na2O-K2O-Al2O2-SiO2-H2O contains many mineral phases of major importance in the diagenesis and metamorphism of shales and sandstones, as well as in felsic igneous rocks and their metamorphic derivatives. It is thus a useful model-system containing many of the key equilibria of concern in the genesis of such rocks. It is also a system for which extensive experimental and thermodynamic da...... hiện toàn bộ
Ultramafic inclusions and high-pressure xenocrysts in submarine basanitoid, equatorial Mid-Atlantic Ridge
Springer Science and Business Media LLC - Tập 70 - Trang 49-57 - 1979
John M. Sinton
A basanitoid dredged from near St. Paul's Rocks represents the first reported occurrence of an abyssal lava containing ultramafic xenoliths and high-pressure xenocrysts. The xenoliths include three separate populations. A suite of clinopyroxene-poor spinel-harzburgite and spinel-lherzolite inclusions have tectonite textures and highly refractory mineral compositions; these nodules probably represe...... hiện toàn bộ
Geochemical investigation of a semi-continuous extrusive basaltic section from the Deccan Volcanic Province, India: implications for the mantle and magma chamber processes
Springer Science and Business Media LLC - Tập 159 - Trang 839-862 - 2009
Kopparapu Vijaya Kumar, Chakradhar Chavan, Sariput Sawant, K. Naga Raju, Prachiti Kanakdande, Sangita Patode, Krishna Deshpande, S. K. G. Krishnamacharyulu, T. Vaideswaran, V. Balaram
Spatial and temporal variations in the geochemistry of an extrusive basaltic section of Deccan traps record progressive changes in mantle melting and crustal filtration and are relevant to understand continental flood basalt (CFB) magmatism. In the present work we have carried out detailed field, petrographic, density and magnetic susceptibility, and geochemical investigations on a small, semi-con...... hiện toàn bộ
Diffusion gradients in an eclogite xenolith from the Roberts Victor kimberlite pipe: (2) kinetics and implications for petrogenesis
Springer Science and Business Media LLC - Tập 105 - Trang 637-649 - 1990
Violaine Sautter, Ben Harte
In a bimineralic eclogite xenolith (sample JJG41) from the Roberts Victor kimberlite, compositional gradients in clinopyroxene are related to garnet exsolution. Two principal reactions involving clinopyroxene and garnet occur: (i) The net-transfer Al2Si-1Mg-1 which is responsible for garnet growth according to the equation 2Di+Al2Si-1Mg-1=Grossular+MgCa-1 (reaction 1). This has created substantial...... hiện toàn bộ
Trough structures in the Western syenite of Kûngnât, S Greenland: mineralogy and mechanism of formation
Springer Science and Business Media LLC - Tập 127 - Trang 46-56 - 1997
M. E. Hodson, Adrian A. Finch
In the Western layered syenite stock of the Kûngnât complex, close to the intrusion wall, there are two groups of regularly spaced, horizontally aligned, stacks of infilled troughs. These features resemble, to some extent, the trough layering within the UZa trough zone of the gabbroic Skaergaard1 intrusion. Such features have never before been described in syenitic rocks. The lower group comprise...... hiện toàn bộ
Determining the composition of C–H–O liquids following high-pressure and high-temperature diamond-trap experiments
Springer Science and Business Media LLC - Tập 165 Số 3 - Trang 593-599 - 2013
Omri Dvir, Alon Angert, R. Kessel
Evidence for non-lithostatic pressure in subducted continental crust
Springer Science and Business Media LLC - Tập 175 - Trang 1-15 - 2019
J. A. Cutts, M. A. Smit, J. C. Vrijmoed
Continental crust buried during collisional orogeny typically records pressures of 3 GPa or lower; however, pressures much higher than this are recorded locally, which would suggest burial to mantle depths. Deep continental subduction is not observed in active orogens and should be hindered by the positive buoyancy of sialic crust relative to the mantle. Non-lithostatic pressure caused by mechanic...... hiện toàn bộ
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